1 | unit UPersistentForm;
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2 |
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3 | {$mode delphi}
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4 |
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5 | // Date: 2015-04-18
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6 |
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7 | interface
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8 |
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9 | uses
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10 | Classes, SysUtils, Forms, URegistry, LCLIntf, Registry, Controls, ComCtrls;
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11 |
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12 | type
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13 |
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14 | { TPersistentForm }
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15 |
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16 | TPersistentForm = class(TComponent)
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17 | private
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18 | FEntireVisible: Boolean;
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19 | FMinVisiblePart: Integer;
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20 | FRegistryContext: TRegistryContext;
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21 | procedure LoadControl(Control: TControl);
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22 | procedure SaveControl(Control: TControl);
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23 | public
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24 | FormNormalSize: TRect;
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25 | FormRestoredSize: TRect;
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26 | FormWindowState: TWindowState;
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27 | Form: TForm;
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28 | procedure LoadFromRegistry(RegistryContext: TRegistryContext);
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29 | procedure SaveToRegistry(RegistryContext: TRegistryContext);
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30 | function CheckEntireVisible(Rect: TRect): TRect;
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31 | function CheckPartVisible(Rect: TRect; Part: Integer): TRect;
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32 | procedure Load(Form: TForm; DefaultMaximized: Boolean = False);
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33 | procedure Save(Form: TForm);
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34 | constructor Create(AOwner: TComponent); override;
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35 | property RegistryContext: TRegistryContext read FRegistryContext
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36 | write FRegistryContext;
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37 | published
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38 | property MinVisiblePart: Integer read FMinVisiblePart write FMinVisiblePart;
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39 | property EntireVisible: Boolean read FEntireVisible write FEntireVisible;
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40 | end;
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41 |
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42 | procedure Register;
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43 |
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44 | implementation
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45 |
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46 |
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47 | procedure Register;
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48 | begin
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49 | RegisterComponents('Common', [TPersistentForm]);
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50 | end;
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51 |
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52 | { TPersistentForm }
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53 |
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54 | procedure TPersistentForm.LoadControl(Control: TControl);
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55 | var
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56 | I: Integer;
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57 | WinControl: TWinControl;
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58 | begin
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59 | if Control is TListView then begin
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60 | with Form, TRegistryEx.Create do
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61 | try
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62 | RootKey := RegistryContext.RootKey;
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63 | OpenKey(RegistryContext.Key + '\Forms\' + Form.Name + '\' + Control.Name, True);
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64 | for I := 0 to TListView(Control).Columns.Count - 1 do begin
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65 | if ValueExists('ColWidth' + IntToStr(I)) then
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66 | TListView(Control).Columns[I].Width := ReadInteger('ColWidth' + IntToStr(I));
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67 | end;
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68 | finally
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69 | Free;
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70 | end;
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71 | end;
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72 |
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73 | if Control is TWinControl then begin
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74 | WinControl := TWinControl(Control);
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75 | if WinControl.ControlCount > 0 then begin
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76 | for I := 0 to WinControl.ControlCount - 1 do begin
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77 | if WinControl.Controls[I] is TControl then begin
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78 | LoadControl(WinControl.Controls[I]);
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79 | end;
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80 | end;
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81 | end;
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82 | end;
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83 | end;
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84 |
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85 | procedure TPersistentForm.SaveControl(Control: TControl);
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86 | var
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87 | I: Integer;
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88 | WinControl: TWinControl;
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89 | begin
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90 | if Control is TListView then begin
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91 | with Form, TRegistryEx.Create do
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92 | try
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93 | RootKey := RegistryContext.RootKey;
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94 | OpenKey(RegistryContext.Key + '\Forms\' + Form.Name + '\' + Control.Name, True);
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95 | for I := 0 to TListView(Control).Columns.Count - 1 do begin
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96 | WriteInteger('ColWidth' + IntToStr(I), TListView(Control).Columns[I].Width);
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97 | end;
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98 | finally
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99 | Free;
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100 | end;
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101 | end;
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102 |
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103 | if Control is TWinControl then begin
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104 | WinControl := TWinControl(Control);
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105 | if WinControl.ControlCount > 0 then begin
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106 | for I := 0 to WinControl.ControlCount - 1 do begin
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107 | if WinControl.Controls[I] is TControl then begin
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108 | SaveControl(WinControl.Controls[I]);
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109 | end;
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110 | end;
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111 | end;
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112 | end;
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113 | end;
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114 |
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115 | procedure TPersistentForm.LoadFromRegistry(RegistryContext: TRegistryContext);
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116 | begin
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117 | with TRegistryEx.Create do
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118 | try
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119 | RootKey := RegistryContext.RootKey;
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120 | OpenKey(RegistryContext.Key + '\Forms\' + Form.Name, True);
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121 | // Normal size
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122 | FormNormalSize.Left := ReadIntegerWithDefault('NormalLeft', FormNormalSize.Left);
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123 | FormNormalSize.Top := ReadIntegerWithDefault('NormalTop', FormNormalSize.Top);
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124 | FormNormalSize.Right := ReadIntegerWithDefault('NormalWidth', FormNormalSize.Right - FormNormalSize.Left)
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125 | + FormNormalSize.Left;
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126 | FormNormalSize.Bottom := ReadIntegerWithDefault('NormalHeight', FormNormalSize.Bottom - FormNormalSize.Top)
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127 | + FormNormalSize.Top;
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128 | // Restored size
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129 | FormRestoredSize.Left := ReadIntegerWithDefault('RestoredLeft', FormRestoredSize.Left);
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130 | FormRestoredSize.Top := ReadIntegerWithDefault('RestoredTop', FormRestoredSize.Top);
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131 | FormRestoredSize.Right := ReadIntegerWithDefault('RestoredWidth', FormRestoredSize.Right - FormRestoredSize.Left)
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132 | + FormRestoredSize.Left;
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133 | FormRestoredSize.Bottom := ReadIntegerWithDefault('RestoredHeight', FormRestoredSize.Bottom - FormRestoredSize.Top)
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134 | + FormRestoredSize.Top;
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135 | // Other state
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136 | FormWindowState := TWindowState(ReadIntegerWithDefault('WindowState', Integer(wsNormal)));
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137 | finally
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138 | Free;
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139 | end;
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140 | end;
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141 |
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142 | procedure TPersistentForm.SaveToRegistry(RegistryContext: TRegistryContext);
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143 | begin
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144 | with Form, TRegistryEx.Create do
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145 | try
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146 | RootKey := RegistryContext.RootKey;
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147 | OpenKey(RegistryContext.Key + '\Forms\' + Form.Name, True);
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148 | // Normal state
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149 | WriteInteger('NormalWidth', FormNormalSize.Right - FormNormalSize.Left);
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150 | WriteInteger('NormalHeight', FormNormalSize.Bottom - FormNormalSize.Top);
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151 | WriteInteger('NormalTop', FormNormalSize.Top);
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152 | WriteInteger('NormalLeft', FormNormalSize.Left);
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153 | // Restored state
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154 | WriteInteger('RestoredWidth', FormRestoredSize.Right - FormRestoredSize.Left);
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155 | WriteInteger('RestoredHeight', FormRestoredSize.Bottom - FormRestoredSize.Top);
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156 | WriteInteger('RestoredTop', FormRestoredSize.Top);
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157 | WriteInteger('RestoredLeft', FormRestoredSize.Left);
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158 | // Other state
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159 | WriteInteger('WindowState', Integer(FormWindowState));
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160 | finally
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161 | Free;
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162 | end;
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163 | end;
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164 |
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165 | function TPersistentForm.CheckEntireVisible(Rect: TRect): TRect;
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166 | var
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167 | Width: Integer;
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168 | Height: Integer;
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169 | begin
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170 | Result := Rect;
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171 | Width := Rect.Right - Rect.Left;
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172 | Height := Rect.Bottom - Rect.Top;
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173 | if Result.Left < (Screen.DesktopLeft) then begin
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174 | Result.Left := Screen.DesktopLeft;
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175 | Result.Right := Screen.DesktopLeft + Width;
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176 | end;
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177 | if Result.Right > (Screen.DesktopLeft + Screen.DesktopWidth) then begin
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178 | Result.Left := Screen.DesktopLeft + Screen.DesktopWidth - Width;
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179 | Result.Right := Screen.DesktopLeft + Screen.DesktopWidth;
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180 | end;
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181 | if Result.Top < Screen.DesktopTop then begin
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182 | Result.Top := Screen.DesktopTop;
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183 | Result.Bottom := Screen.DesktopTop + Height;
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184 | end;
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185 | if Result.Bottom > (Screen.DesktopTop + Screen.DesktopHeight) then begin
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186 | Result.Top := Screen.DesktopTop + Screen.DesktopHeight - Height;
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187 | Result.Bottom := Screen.DesktopTop + Screen.DesktopHeight;
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188 | end;
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189 | end;
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190 |
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191 | function TPersistentForm.CheckPartVisible(Rect: TRect; Part: Integer): TRect;
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192 | var
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193 | Width: Integer;
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194 | Height: Integer;
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195 | begin
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196 | Result := Rect;
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197 | Width := Rect.Right - Rect.Left;
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198 | Height := Rect.Bottom - Rect.Top;
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199 | if Result.Right < (Screen.DesktopLeft + Part) then begin
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200 | Result.Left := Screen.DesktopLeft + Part - Width;
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201 | Result.Right := Screen.DesktopLeft + Part;
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202 | end;
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203 | if Result.Left > (Screen.DesktopLeft + Screen.DesktopWidth - Part) then begin
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204 | Result.Left := Screen.DesktopLeft + Screen.DesktopWidth - Part;
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205 | Result.Right := Screen.DesktopLeft + Screen.DesktopWidth - Part + Width;
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206 | end;
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207 | if Result.Bottom < (Screen.DesktopTop + Part) then begin
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208 | Result.Top := Screen.DesktopTop + Part - Height;
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209 | Result.Bottom := Screen.DesktopTop + Part;
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210 | end;
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211 | if Result.Top > (Screen.DesktopTop + Screen.DesktopHeight - Part) then begin
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212 | Result.Top := Screen.DesktopTop + Screen.DesktopHeight - Part;
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213 | Result.Bottom := Screen.DesktopTop + Screen.DesktopHeight - Part + Height;
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214 | end;
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215 | end;
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216 |
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217 | procedure TPersistentForm.Load(Form: TForm; DefaultMaximized: Boolean = False);
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218 | begin
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219 | Self.Form := Form;
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220 | // Set default
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221 | FormNormalSize := Bounds((Screen.Width - Form.Width) div 2,
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222 | (Screen.Height - Form.Height) div 2, Form.Width, Form.Height);
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223 | FormRestoredSize := Bounds((Screen.Width - Form.Width) div 2,
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224 | (Screen.Height - Form.Height) div 2, Form.Width, Form.Height);
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225 |
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226 | LoadFromRegistry(RegistryContext);
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227 |
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228 | if not EqualRect(FormNormalSize, FormRestoredSize) or
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229 | DefaultMaximized then begin
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230 | // Restore to maximized state
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231 | Form.WindowState := wsNormal;
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232 | if not EqualRect(FormRestoredSize, Form.BoundsRect) then
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233 | Form.BoundsRect := FormRestoredSize;
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234 | Form.WindowState := wsMaximized;
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235 | end else begin
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236 | // Restore to normal state
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237 | Form.WindowState := wsNormal;
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238 | if FEntireVisible then FormNormalSize := CheckEntireVisible(FormNormalSize)
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239 | else if FMinVisiblePart > 0 then
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240 | FormNormalSize := CheckPartVisible(FormNormalSize, FMinVisiblePart);
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241 | if not EqualRect(FormNormalSize, Form.BoundsRect) then
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242 | Form.BoundsRect := FormNormalSize;
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243 | end;
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244 | LoadControl(Form);
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245 | end;
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246 |
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247 | procedure TPersistentForm.Save(Form: TForm);
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248 | begin
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249 | Self.Form := Form;
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250 | FormNormalSize := Bounds(Form.Left, Form.Top, Form.Width, Form.Height);
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251 | FormRestoredSize := Bounds(Form.RestoredLeft, Form.RestoredTop, Form.RestoredWidth,
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252 | Form.RestoredHeight);
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253 | FormWindowState := Form.WindowState;
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254 | SaveToRegistry(RegistryContext);
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255 | SaveControl(Form);
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256 | end;
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257 |
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258 | constructor TPersistentForm.Create(AOwner: TComponent);
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259 | begin
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260 | inherited;
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261 | if AOwner is TForm then Form := TForm(AOwner)
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262 | else Form := nil;
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263 | FMinVisiblePart := 50;
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264 | FRegistryContext.RootKey := HKEY_CURRENT_USER;
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265 | end;
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266 |
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267 | end.
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268 |
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